GOG says it's Y but Y doesnt work for me

Y works fine for me, but I use this:
https://github.com/VFansss/mgs2-v-s-fix

And what about Metal Gear? I have figured out you move by arrows and you save by pressing enter. How do i receive codec calls

EDIT okay its the D button

EDIT 2 to save the game you need to press enter and then F


EDIT 3

Its C actually